Wind field structure for ultra-large breadth printing and air volume adjusting method of wind field structure

Abstract

The invention relates to a wind field structure for ultra-large breadth printing and an air volume adjusting method thereof, the wind field structure comprises a main air duct, one end of the main air duct is connected with a first air blowing opening of a forming cavity, the other end of the main air duct is connected with a first air suction opening, and the main air duct is used for blowing air to the inner bottom of the forming cavity through the first air blowing opening; one end of the air supplementing channel is connected with a second air blowing opening of the forming cavity, the other end of the air supplementing channel is connected with the first air suction opening, and the air supplementing channel is used for supplementing air into the forming cavity through the second air blowing opening; and one end of the upper air duct is connected with the third air blowing opening of the forming cavity, the other end of the upper air duct is connected with the second air suction opening, and the upper air duct is used for blowing air to the top in the forming cavity. Through the wind field structure of the three-inlet and double-outlet air ducts, the problem of attenuation of the wind speed in the wind direction is solved, and meanwhile the requirement for the air volume of equipment can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, and particularly relates to a wind field structure for ultra-large format printing and a method for adjusting the air volume thereof. Background Art

[0002] In the metal 3D printing industry, after the active metal powder is melted at high temperature by a laser, active metal dust and active oxides will be generated. If such metal waste residues fall in the powder sintering area, it is extremely easy to cause powder surface defects, resulting in abnormal quality of sintered parts and damage to the doctor blade, etc. Therefore, a well-performing wind field is very important.

[0003] However, in ultra-large format devices, such as devices with ultra-large printing formats of 1000mm x 1000mm, 1500mm x 1500mm, etc., along the wind direction, the attenuation of the wind speed is inevitable, and the attenuation amplitude can even reach 30 - 40%. This will cause the dust and large particulate matter near the air return opening of the cavity not to be blown away, resulting in powder surface defects and abnormal workpiece quality; if the air volume of the air return opening is increased, the total wind speed needs to be increased, which will cause the wind speed near the air blowing opening to be very high, and the powder on the powder bed will be easily blown away, resulting in abnormal powder surface defects, etc., and will also cause abnormal workpiece quality.

[0004] Currently, there are two mainstream wind field structures in the industry:

[0005] 1) Using an ultra-large air inlet, that is, a wind wall structure, to increase the overall air volume of the wind field and make up for the problem of wind speed attenuation. However, this will cause a very large load on the fan, resulting in problems such as high equipment power consumption, large damage, high noise, and unstable and difficult-to-control wind speed.

[0006] 2) Using the method of blowing air from both sides at the top and discharging air at the bottom, reducing the distance along the wind direction. However, this results in the wind speed at the center of the printing format being almost zero, so the quality of the workpieces in the central part is poor. Summary of the Invention

[0007] In order to solve the problems in the background art, the present invention provides a wind field structure for ultra-large format printing and a method for adjusting the air volume thereof, which solves the problem of wind speed attenuation along the wind direction in the ultra-large format wind field and improves the uniformity of the wind field along the wind direction.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] On the one hand, the present invention provides a wind field structure for ultra-large format printing, characterized in that a first air blowing port, a second air blowing port and a third air blowing port are arranged on one side of the forming cavity, and a first air suction port and a second air suction port are arranged on the other side; the first air blowing port and the second air blowing port are arranged at the bottom on one side of the forming cavity, the second air blowing port is located above the first air blowing port and close to the first air blowing port, and the third air blowing port is arranged at the top on one side of the forming cavity; the first air suction port is opposite to the first air blowing port, and the second air suction port is opposite to the third air blowing port; the wind field structure further includes:

[0010] A main air duct, one end of the main air duct is connected to the first air blowing port of the forming cavity, and the other end is connected to the first air suction port, for blowing air to the inner bottom of the forming cavity through the first air blowing port;

[0011] A supplementary air duct, one end of the supplementary air duct is connected to the second air blowing port of the forming cavity, and the other end returns air through the first air suction port, and the supplementary air duct is used for making up air to the inside of the forming cavity through the second air blowing port;

[0012] An upper air duct, one end of the upper air duct is connected to the third air blowing port of the forming cavity, and the other end is connected to the second air suction port, for blowing air to the inner top of the forming cavity.

[0013] Further, it further includes a lower air duct fan, an upper air duct fan, a lower air duct anemometer and an upper air duct anemometer. The lower air duct fan and the lower air duct anemometer are arranged on the main air duct, and the upper air duct fan and the upper air duct anemometer are arranged on the upper air duct.

[0014] Further, one end of the supplementary air duct is connected to the main air duct and is indirectly connected to the first air suction port through the main air duct, and the other end is communicated with the second air blowing port. The lower air duct fan and the lower air duct anemometer are located upstream of the supplementary air duct.

[0015] Further, the wind field structure further includes a stop valve, and the stop valve is arranged on the supplementary air duct for adjusting the air speed of the supplementary air duct.

[0016] Further, the widths of the first air blowing port, the second air blowing port and the third air blowing port are basically the same, and the heights of the second air blowing port and the third air blowing port are less than that of the first air blowing port.

[0017] Further, the height of the second air blowing port is half of the height of the first air blowing port, and the height of the third air blowing port is 50% - 100% of the height of the first air blowing port.

[0018] Further, the main air duct includes a main air duct inlet pipe and a multi-stage main air equalizing mechanism. The main air duct inlet pipe is connected to the first air outlet through the multi-stage main air equalizing mechanism. The make-up air duct includes a make-up air duct inlet pipe and a multi-stage make-up air equalizing mechanism. The make-up air duct inlet pipe is connected to the second air outlet through the multi-stage make-up air equalizing mechanism. The upper air duct is connected to the third air outlet through the multi-stage upper air equalizing mechanism. Each stage of the main air equalizing mechanism, make-up air equalizing mechanism, and upper air equalizing mechanism includes at least one equalizing air duct and a perforated plate. The multiple equalizing air ducts and perforated plates are alternately connected in sequence to form multiple stages.

[0019] Further, the main air duct further includes a main air duct return pipe, a plurality of lower return air ducts, and a lower return air reducer. The main air duct return pipe, the lower return air reducer, the plurality of lower return air ducts, and the first air suction port are sequentially and fixedly connected in a sealed manner. The upper air duct further includes an upper air duct return pipe, a plurality of upper return air ducts, and an upper return air reducer. The upper air duct return pipe, the upper return air reducer, the plurality of upper return air ducts, and the second air suction port are fixedly connected in a sealed manner at one time.

[0020] Further, a partition is used to separate the first air outlet and the second air outlet.

[0021] On the other hand, the present invention also provides a method for adjusting the air volume of the air field structure for ultra-large format printing, including the steps of:

[0022] S1. Set the wind speeds of the upper air duct, the main air duct, and the make-up air duct respectively;

[0023] S2. When starting printing, start the lower air duct fan and the upper air duct fan. The upper air duct fan and the lower air duct fan perform PID regulation according to the set wind speeds respectively. At the same time, adjust the cut-off valve located in the make-up air duct so that the main air duct, the upper air duct, and the make-up air duct all reach the stable wind speed set value;

[0024] S3. The lower air duct anemometer and the upper air duct anemometer detect the air volumes of the main air duct and the upper air duct respectively, and feed the detected results back to the controller. The controller controls the upper air duct fan and the lower air duct fan to perform PID regulation so that the main air duct, the upper air duct, and the make-up air duct always maintain the stable wind speed set value.

[0025] Due to the above technical solutions adopted by the present invention, it has the following advantages:

[0026] (1) The present invention adopts a structure of a three-inlet and two-outlet air duct formed by including a main air duct, a make-up air duct, and an upper air duct, and the two ends of the main air duct, the make-up air duct, and the upper air duct are respectively connected to the air outlets and air suction ports on both sides of the working chamber, reducing the attenuation problem of the wind speed along the wind direction, and at the same time, it can also reduce the air volume requirement of the equipment.

[0027] (2) An independent control system for multiple fans is adopted. The upper air duct fan provides the air volume required for the thin upper air duct, and forms a closed-loop circulation circuit in combination with the wind speed monitoring of the upper air duct anemometer. The lower air duct fan provides the air volume required for the lower main air duct and the thin upper air supply duct, and forms a closed-loop circulation circuit in combination with the wind speed monitoring of the lower air duct anemometer, realizing the wind speed control of each air duct, reducing the volatility of the wind speed, and at the same time reducing problems such as equipment noise.

[0028] (3) A stop valve is also provided in the present invention to adjust the air volume of the air supply duct, making the air supply controllable and further improving the controllability of the wind speed.

[0029] (4) The second air outlet and the third air outlet in the present invention form a thin air outlet relative to the first air outlet. The thin upper air duct is used to protect the galvanometer at the top of the forming cavity from being polluted, and the thin type reduces the air volume demand; the thin upper air supply duct is used to compensate the air volume of the lower layer, increase the wind speed of the return air outlet, reduce the air volume demand of the lower layer air, and the air supply duct can suppress the air volume divergence of the lower main air duct and supplement the air volume. The air supply duct can improve the uniformity in the X and Z directions, and cooperate with the multi-stage air flow equalization to improve the uniformity of the wind field in the Y direction.

[0030] (5) It includes a multi-stage air flow equalization structure formed by multiple air flow equalization ducts and perforated plates, increasing the uniformity of the wind speed in the vertical wind direction. Description of the Drawings

[0031] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0032] Figure 1 is a schematic structural diagram of an embodiment of the wind field structure provided by the present invention;

[0033] Figure 2 is the schematic diagram of the principle of the wind field structure provided by the present invention;

[0034] Figure 3 is a schematic structural diagram of the forming cavity;

[0035] Figure 4 is the simulation cloud map obtained by simulating with the wind field structure provided by the present invention.

[0036] The reference numerals in the drawings are represented as follows:

[0037] 1 - Molding cavity, 2 - First air blowing port, 3 - Second air blowing port, 4 - Third air blowing port, 5 - First air suction port, 6 - Second air suction port, 10 - Main air duct, 101 - Main air duct inlet pipe, 102 - First main air equalizing duct, 103 - Second main air equalizing duct, 104 - Third main air equalizing duct, 105 - Fourth main air equalizing duct, 106, 107 - Lower return air duct, 108 - Lower return air reducer, 109 - Lower return air duct, 110 - First perforated plate, 111 - Second perforated plate, 112 - Third perforated plate, 113 - Fourth perforated plate, 20 - Makeup air duct, 201 - Makeup air duct inlet pipe, 202 - First makeup air equalizing duct, 203 - Second makeup air equalizing duct, 204 - Third makeup air equalizing duct, 205 - Fourth makeup air equalizing duct, 30 - Upper air duct, 301 - Upper air duct inlet pipe, 302 - Air equalizing duct, 303 - Perforated plate. Detailed implementation manners

[0038] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] As Figure 1 and Figure 3 shown, the present invention provides a wind field structure for ultra - large - format printing. A first air blowing port 2, a second air blowing port 3, and a third air blowing port 4 are provided on one side of the molding cavity, and a first air suction port 5 and a second air suction port 6 are provided on the other side; the first air blowing port 2 and the second air blowing port 3 are provided at the bottom on one side of the molding cavity 1, the second air blowing port 2 is located above the first air blowing port 3 and is close to the first air blowing port 2, and the third air blowing port 3 is provided at the top on one side of the molding cavity 1; the first air suction port 2 is opposite to the first air blowing port 3, and the second air suction port 3 is opposite to the third air blowing port 4.

[0040] The wind field structure further includes a main air duct 10, a makeup air duct 20, and an upper air duct 30. One end of the main air duct 10 is connected to the first air blowing port of the molding cavity 100, and the other end is connected to the first air suction port 5, for blowing air into the bottom of the molding cavity 100 through the first air blowing port 2; one end of the makeup air duct 20 is connected to the second air blowing port 3 of the molding cavity 100, and the other end returns air through the first air suction port 5. The makeup air duct 20 is used for making up air into the molding cavity 100 through the second air blowing port 3; one end of the upper air duct 30 is connected to the third air blowing port 4 of the molding cavity 100, and the other end is connected to the second air suction port 6, for blowing air into the top of the molding cavity 100.

[0041] During laser powder sintering, splashes and black smoke are generated during the sintering process. The main air duct 10 blows air into the molding cavity 100 through the first air blowing port 2, blowing away most of the splashes, soot, etc. generated above the substrate, and sucking them away through the first air suction port 5. At the same time, in order to reduce the problem of air volume attenuation on the side close to the air suction port caused by the relatively large printing area, the air volume is supplemented through the supplementary air duct 20, avoiding the upward rise of the air volume of the main air duct at one end far from the air blowing port, resulting in wind field attenuation, improving the uniformity of the air flow along the X direction in ultra-large format printing, and improving the printing quality. The upper air duct 30 blows air into the working cavity through the third air blowing port 4, which can prevent dust and soot from adhering to the field lens, avoid affecting the laser irradiation intensity, and further improve the printing quality.

[0042] The present invention includes two air suction ports, specifically the first air suction port 5 and the second air suction port 6. The first air suction port 5 is mainly used to suck away the air volume blown in from the main air duct 10 and the supplementary air duct 20, and the second air suction port 6 is mainly used to suck away the air volume located at the top of the molding cavity 100 near the top plate. Compared with the prior art that only uses one air suction port, the present invention can avoid the interference of the air volume entering from the upper air duct 30 on the air volume below, effectively improving the uniformity of the overall wind field and further improving the protection of the galvanometer.

[0043] The present invention adopts a structure of a three-in and two-out air duct including the main air duct 10, the supplementary air duct 20, and the upper air duct 30, and both ends of the main air duct 10, the supplementary air duct 20, and the upper air duct 30 are connected to the corresponding air blowing ports and air suction ports on both sides of the molding cavity 100, reducing the attenuation problem of the wind speed along the wind direction. At the same time, compared with the existing method of increasing the air volume, it can also reduce the air volume demand of the equipment.

[0044] More specifically, the widths of the first air blowing port 2, the second air blowing port 3, and the third air blowing port 4 in the present invention are basically the same, and the heights of the second air blowing port 3 and the third air blowing port 4 are less than that of the first air blowing port 2. To ensure the blowing effect on splashes and soot, preferably, the widths of the first air blowing port 2, the second air blowing port 3, and the third air blowing port 4 are preferably 115% - 130% of the molding width.

[0045] Preferably, the height of the second air outlet 3 is half of the height of the first air outlet 2, and the height of the third air outlet 4 is 50% - 100% of the height of the first air outlet 2. The second air outlet 3 and the third air outlet in the present invention form a thin air outlet relative to the first air outlet 2. The thin upper air duct is used to protect the galvanometer at the top of the molding cavity from being contaminated, and the thin size reduces the air volume requirement; the thin upper air supply duct 20 is used to compensate the air volume of the lower layer, increase the air velocity at the air return opening, reduce the air volume requirement of the lower layer air, and the air supply duct 20 can inhibit the divergence of the air volume in the lower main air duct 10 and supplement the air volume. The air supply duct 20 can improve the uniformity in the X and Z directions, and cooperate with the multi-stage air distribution to improve the uniformity of the Y-direction air field, where the X direction refers to the direction along the air velocity, the Y direction refers to the direction that is in the same horizontal plane as the X direction and perpendicular to it, and the Z direction refers to the height direction of the molding cavity.

[0046] Preferably, the center distance between the lower main air duct 10 and the air supply duct 20 is about 2.5 - 5 times the height of the air outlet of the air supply duct 20. In the present invention, through the optimized design of the specific dimensions of the air field structure, the intensity and uniformity of the air field can be further effectively improved.

[0047] The width of the first air suction port 2 is preferably 90% - 100% of the width of the first air outlet; the height of the first air suction port 2 is preferably similar to the height of the first air blowing port 2.

[0048] As Figure 2 As shown, in order to further improve the stability of the air velocity and reduce the fluctuation, the air field structure further includes a lower air duct fan, an upper air duct fan, a lower air duct anemometer, and an upper air duct anemometer. The lower air duct fan and the lower air duct anemometer are arranged on the main air duct 10, and the upper air duct fan and the upper air duct anemometer are arranged on the upper air duct 30. The lower air duct anemometer is arranged downstream of the lower air duct fan, the upper air duct anemometer is arranged downstream of the upper air duct fan, and the lower air duct anemometer is arranged downstream of the lower air duct anemometer.

[0049] The lower air duct fan serves as the power source for the main air duct 10 and the air supply duct 20 to provide the air volume of the lower layer; the upper air duct fan serves as the power source for the upper air duct 30 to provide the air volume of the upper layer. Adopting an independent control system for multiple fans, the upper air duct fan provides the air volume requirement of the thin upper air duct 30 and forms a closed-loop cycle in combination with the wind speed monitoring of the upper air duct anemometer. The lower air duct fan provides the air volume requirements of the lower main air duct 10 and the thin upper air supply duct 20 and forms a closed-loop cycle in combination with the wind speed monitoring of the lower air duct anemometer to achieve the wind speed control of each air duct, reduce the volatility of the wind speed, and at the same time reduce problems such as equipment noise.

[0050] One end of the air supply duct 20 is connected to the main duct 10 and is indirectly connected to the first air suction port 5 through the main duct 10, and the other end is communicated with the second air blowing port 3. The lower duct fan and the lower duct anemometer are located upstream of the air supply duct 20. The wind field structure further includes a stop valve, and the stop valve is arranged on the air supply duct 20. The stop valve is used to adjust the air volume of the air supply duct 20, so that the air supply is controllable, and the flexibility of the air volume adjustment of the wind field structure is improved.

[0051] The main duct includes a main duct inlet pipe 101 and a multi-stage main air equalizing mechanism. The main duct inlet pipe 101 is connected to the first air blowing port 2 through the multi-stage main air equalizing mechanism. The air supply duct 20 includes an air supply duct inlet pipe 201 and a multi-stage air supply equalizing mechanism. The air supply duct inlet pipe 201 and the second air blowing port 3 are connected through the multi-stage air supply equalizing mechanism. The upper duct inlet pipe 301 and the third air blowing port 4 are connected through a multi-stage upper air equalizing mechanism. The main air equalizing mechanism, the air supply equalizing mechanism and the upper air equalizing mechanism all include at least one equalizing duct and a perforated plate. The equalizing duct is connected to one side or both sides of the perforated plate, and the perforated plate can be a porous structure, preferably a honeycomb structure.

[0052] Specifically, as Figure 1 described, the multi-stage main air equalizing mechanism includes a first main air equalizing duct 102, a second main air equalizing duct 103, a third main air equalizing duct 104, and a fourth main air equalizing duct 105. The multi-stage air supply equalizing mechanism includes a first air supply equalizing duct 202, a second air supply equalizing duct 203, a third air supply equalizing duct 204, and a fourth air supply equalizing duct 205. The perforated plates include a first perforated plate 110, a second perforated plate 111, a third perforated plate 112, and a fourth perforated plate 113.

[0053] The main duct inlet pipe 101 is tightly sealed with the lower end of one side of the first perforated plate 110 through a gasket and screws. The first main air equalizing duct 102 is fixedly connected to the lower end of the other side of the first perforated plate 110 in a sealed manner. The main duct inlet pipe 101, the first main air equalizing duct 102, and the first perforated plate constitute the first-stage main air equalizing mechanism.

[0054] The first main air equalizing duct 102 is connected to the second main air equalizing duct 103. The second main air equalizing duct 103 and the third main air equalizing duct 104 are respectively connected to both sides of the bottom of the second perforated plate 111. The second main air equalizing duct 102, the third main air equalizing duct 104, and the second perforated plate 111 constitute the second-stage main air equalizing mechanism.

[0055] The third main air distribution duct 104 and the fourth main air distribution duct 105 are respectively fixedly connected to the bottoms on both sides of the third perforated plate 112. The third main air distribution duct 104, the fourth main air distribution duct 105 and the third perforated plate 112 constitute the main air distribution mechanism of the third stage.

[0056] The fourth main air distribution duct 105 is fixedly connected to the bottom of one side of the fourth perforated plate 113. The other side of the fourth perforated plate 113 is fixedly installed at the first air outlet 2. The fourth perforated plate 113 and the fourth main air distribution duct 105 constitute the main air distribution mechanism of the fourth stage.

[0057] The air supply duct inlet pipe 201 and the upper end of one side of the first perforated plate 110 are tightly sealed by a gasket and screws. The first air supply distribution duct 202 and the upper end of the other side of the first perforated plate 110 are tightly sealed by a gasket and screws. The air supply duct inlet pipe 201, the first perforated plate 110 and the first air supply distribution duct 202 constitute the air supply distribution mechanism of the first stage.

[0058] The first air supply distribution duct 202 is hermetically and fixedly connected to the second air supply distribution duct 203. The second air supply distribution duct 203, the third air supply distribution duct 204 and the second perforated plate 111 constitute the air supply distribution mechanism of the second stage.

[0059] The third air supply distribution duct 204, the fourth air supply distribution duct 205 and the third perforated plate 112 constitute the air supply distribution mechanism of the third stage. The fourth air supply distribution duct 205 and the fourth perforated plate 113 constitute the air supply distribution mechanism of the fourth stage. The air supply duct inlet pipe 201, the upper end of the first perforated plate 110, the first air supply distribution duct 202, the second air supply distribution duct 203, the second perforated plate 111, the third air supply distribution duct 204, the third perforated plate 112, the fourth air supply distribution duct 205 and the fourth perforated plate 113 are fixedly connected in sequence. The fourth perforated plate 113 is fixedly installed at the second air outlet.

[0060] The perforated plates at the same connection node positions of the perforated plates of the main air distribution mechanism and the air supply distribution mechanism can be shared or separately provided as different perforated plates. However, for the convenience of installation and connection, it is preferably to share a whole perforated plate.

[0061] The present invention includes a multi-stage air distribution structure formed by a plurality of air distribution ducts and perforated plates, which increases the uniformity of the wind speed in the vertical wind direction.

[0062] It should be noted that the main air duct 10 and the air supply duct 20 can also be designed as one air duct in design, and the internal is separated by a partition.

[0063] The main air duct 10 further includes a main air duct return air duct 109, a plurality of lower return air ducts 106, 107 and a lower return air duct reducer 108. The main air duct return air duct 109, the lower return air duct reducer 108, the plurality of lower return air ducts 107 and the first air suction port are sequentially and fixedly connected in a sealed manner. The upper air duct 30 further includes an upper return air duct 209, a plurality of upper return air ducts and an upper return air duct reducer. The upper return air duct, the upper return air duct reducer, the plurality of upper return air ducts and the second air suction port are fixedly connected in a sealed manner at one time.

[0064] The present invention also provides a method for adjusting the air volume of the air field structure for ultra-large format printing as described above, including the steps of:

[0065] S1. Set the wind speeds of the upper air duct 30, the main air duct 10 and the make-up air duct 20 respectively;

[0066] S2. When starting to print, start the lower air duct fan and the upper air duct fan. The upper air duct fan and the lower air duct fan respectively perform PID regulation according to the set wind speeds. At the same time, adjust the cut-off valve located in the make-up air duct 20 so that the main air duct 10, the upper air duct 30 and the make-up air duct 20 all reach the stable wind speed set value;

[0067] S3. The lower air duct anemometer and the upper air duct anemometer respectively detect the air volumes of the main air duct 10 and the upper air duct 30, and feed back the detected results to the controller. The controller controls the upper air duct fan and the lower air duct fan to perform PID regulation so that the main air duct 10, the upper air duct 30 and the make-up air duct 20 always maintain the stable wind speed set value.

[0068] The present invention adopts an independent control system for multiple fans. The upper air duct fan provides the air volume required for the thin upper air duct, and forms a closed-loop cycle circuit in combination with the wind speed monitoring of the upper air duct anemometer. The lower air duct fan provides the air volume required for the lower main air duct 10 and the thin upper make-up air duct 20, and forms a closed-loop cycle circuit in combination with the wind speed monitoring of the lower air duct anemometer, realizing the wind speed control of each air duct, reducing the volatility of the wind speed, and at the same time reducing problems such as equipment noise.

[0069] The present invention adjusts the structure of the three-inlet and double-outlet air duct formed by including the main air duct 10, the make-up air duct 20 and the upper air duct 30 respectively, and the two ends of the main air duct 10, the make-up air duct 20 and the upper air duct 30 are respectively connected to the air blowing ports and air suction ports on both sides of the working chamber, reducing the attenuation problem of the wind speed along the wind direction, and at the same time reducing the air volume demand of the equipment. For the air volume, the air volume can be reduced by 30% to 100%, and the denominator is our own designed air volume.

[0070] For example, for equipment of the same specification, the existing designed air volume is 5000m 3 / h, and the air field structure design provided by the present invention is only 2600m3 / h. Figure 4 It is the simulation analysis nephogram obtained by performing simulation analysis using the wind farm structure of the present invention. It can be seen from the figure that with the wind farm structure provided by the present invention, the attenuation along the wind speed direction is only 0.5 m / s, and the wind speed attenuation at the same height position is significantly reduced compared with the prior art.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A wind farm structure for ultra-large format printing, characterized in that: A first blowing port, a second blowing port and a third blowing port are provided on one side of the molding cavity, and a first suction port and a second suction port are provided on the other side; the first blowing port and the second blowing port are provided at the bottom of one side of the molding cavity, the second blowing port is located above the first blowing port and is provided close to the first blowing port, and the third blowing port is provided at the top of one side of the molding cavity; The first air suction port is opposite to the first air blowing port, and the second air suction port is opposite to the third air blowing port; the wind field structure further includes: A main air duct, one end of which is connected to the first blowing port of the molding cavity, and the other end of which is connected to the first suction port, for blowing air toward the bottom of the molding cavity through the first blowing port; An air supply duct, one end of which is connected to the second air outlet of the molding cavity, and the other end of which returns air through the first air intake port, and the air supply duct is used to supply air to the molding cavity through the second air outlet; An upper air duct, one end of which is connected to the third blowing port of the molding cavity, and the other end of which is connected to the second suction port, for blowing air toward the top of the molding cavity.

2. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: It also includes a down-duct fan, an up-duct fan, a down-duct anemometer and an up-duct anemometer. The down-duct fan and the down-duct anemometer are arranged on the main duct, and the up-duct fan and the up-duct anemometer are arranged on the up-duct.

3. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: One end of the supplementary air duct is connected to the main air duct and is indirectly connected to the first air suction port through the main air duct, and the other end is connected to the second air blowing port. The down duct fan and the down duct anemometer are located upstream of the supplementary air duct.

4. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: It also includes a stop valve, which is arranged on the air supply duct and is used to adjust the wind speed of the air supply duct.

5. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: The widths of the first air outlet, the second air outlet and the third air outlet are substantially the same, and the heights of the second air outlet and the third air outlet are smaller than those of the first air outlet.

6. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: The height of the second blowing port is half of the height of the first blowing port, and the height of the third blowing port is 50% to 100% of the height of the first blowing port.

7. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: The main air duct includes a main air duct air inlet pipe and a multi-stage main air uniforming mechanism, the main air duct air inlet pipe and the first blowing port are connected via the multi-stage main air uniforming mechanism, the supplementary air duct includes a supplementary air duct air inlet pipe and a multi-stage supplementary air uniforming mechanism, the supplementary air duct air inlet pipe and the second blowing port are connected via the multi-stage supplementary air uniforming mechanism, the upper air duct air inlet pipe and the third blowing port are connected via the multi-stage upper air uniforming mechanism, each stage of the main air uniforming mechanism, the supplementary air uniforming mechanism and the upper air uniforming mechanism includes at least one uniform air duct and a mesh plate, and a plurality of the uniform air ducts and mesh plates are alternately connected in sequence to form multiple stages.

8. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: The main air duct also includes a main air duct return air duct, multiple lower return air ducts and lower return air diameter-changing openings, and the main air duct return air duct, lower return air diameter-changing openings, multiple lower return air ducts and the first air suction port are sealed and fixedly connected in sequence; the upper air duct also includes an upper air duct return air duct, multiple upper return air ducts and upper return air diameter-changing openings, and the upper air duct return air duct, upper return air diameter-changing openings, multiple upper return air ducts and the second air suction port are sealed and fixedly connected once.

9. The wind farm structure for ultra-large format printing according to claim 1, characterized in that: The first air blowing port and the second air blowing port are separated by a partition.

10. A method for adjusting the air volume of an air field structure for ultra-large format printing according to any one of claims 1 to 9, characterized in that: Includes steps: S1. respectively set the wind speeds of the upper air duct, the main air duct and the supplementary air duct; S2. When printing starts, the down duct fan and the up duct fan are started, and the up duct fan and the down duct fan are PID-controlled according to the set wind speeds, and the stop valve located in the air supply duct is adjusted at the same time, so that the main duct, the up duct and the air supply duct all reach a stable wind speed setting value; S3, the down-duct anemometer and the up-duct anemometer respectively detect the air volume of the main duct and the up-duct in real time, and feed back the detection results to the controller, and the controller controls the up-duct fan and the down-duct fan to perform PID regulation so that the main duct, the up-duct and the make-up air duct always maintain a stable wind speed setting value.

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